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[RESOLVED] DataGridView checkbox column header cell (.Net 4.0).

Hi,
I'm trying to render a checkbox in a datagridview column header so that when the checkbox is checked/unchecked all the cells in that column should be
checked/unchecked accordingly. The datagridview is bound to a database table but the column containing the checkbox header cell is unbound.
The problem is, whenever i click the header checkbox, all the cells in that column are checked but the header checkbox itself gets invisible.
If I click the HEADER (though the checkbox is invisible, still I can click the header) again, all the cells in the column below are unchecked and the header
checkbox becomes visible and unchecked. Everything is happening as expected except the visibility of the header checkbox. Why is it so?
Please suggest how to get rid of it. Regards.
My code follows below: